Fix slirp compilation failure when using a newer gcc

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3505 c046a42c-6fe2-441c-8c8c-71466251a162

slirp/misc.h

@@ -63,7 +63,9 @@ struct emu_t {
 	struct emu_t *next;
 };
 
+#ifndef CONFIG_QEMU
 extern struct emu_t *tcpemu;
+#endif
 
 extern int x_port, x_server, x_display;
 

slirp/tcp_subr.c

@@ -559,7 +559,10 @@ static const struct tos_t tcptos[] = {
 	  {0, 0, 0, 0}
 };
 
-static struct emu_t *tcpemu = 0;
+#ifdef CONFIG_QEMU
+static
+#endif
+struct emu_t *tcpemu = 0;
 
 /*
  * Return TOS according to the above table